Theory of Machine
Which of the following would constitute a link?

Piston and piston rod
Piston, crank pin and crank shaft
Piston, piston rod and cross head
Piston rod and cross head

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

None of these
Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
The algebraic sum of the secondary forces must be equal to zero

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Theory of Machine
Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴
(l₁ + l₂ + l₃)/3
l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³
l₁ + l₂ + l₃

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